Sol-gel transition in polyacrylamide gels by using a fluorescence technique

Yasar Yilmaz, Önder Pekcan, Demet Kaya*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Pyranine (8-hydroxypyrene-1, 3,6-trisulfonic acid, trisodium salt) was used as a floroprobe for monitoring the solution free-radical cross-linking polymerization of acrylamide (AAm) to test the universality class of the sol-gel transition. The spectra of the pyranines shift to shorter wavelengths during the polymerization of AAm. The intensity of the shifted spectra monitors the sol-gel transition, without disturbing the system mechanically. Observations around the critical point show that there are three regimes of AAm concentration in which the gel fraction exponent and the weight-average degree of polymerization exponent differ drastically. They agree best with the static percolation results for higher AAm concentration, but cross over from percolation to mean-field values when AAm concentration is lower than 2 M.

Original languageEnglish
Pages (from-to)255-263
Number of pages9
JournalProgress in Colloid and Polymer Science
Publication statusPublished - 2004


  • Critical exponents
  • Fluorescence technique
  • Sol-gel transition


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